Dear all,
The backup was redirected to /rman/backups like AJ said, but i have a problem. From 17 hours ago the rman process still running and when i executed: ps -efa | grep rman it shows the following:

Thanks for your answer.
I looked for the files that would be in /rman/backups and there are 7 files that was created from JAN-25 and they have different created date.
The size of the files are: 226190262272 bytes, more less.

When i put: LIST BACKUP; it shows the same name that it shows in /rman/backups. So the backups was completed (i guess)

You probably have some serious I/O constraint -- maybe a SAN cable or connector fault or a failed or failing disk. Measure the write throughput you get over 10minutes and 30minutes and then raise a ticket with your Server and Storage teams.